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Table 60 Class B subnet planning
No. "Borrowed" Host Bits
5
6
7
8
9
10
11
12
13
14
15
Subnet Mask
255.255.248.0 (/21)
255.255.252.0 (/22)
255.255.254.0 (/23)
255.255.255.0 (/24)
255.255.255.128 (/25) 512
255.255.255.192 (/26) 1 024
255.255.255.224 (/27) 2 048
255.255.255.240 (/28) 4 096
255.255.255.248 (/29) 8 192
255.255.255.252 (/30) 16 384
255.255.255.254 (/31) 32 768
BCM50e Integrated Router Configuration - Advanced
Appendix G IP subnetting 241
No. Subnets
No. Hosts per Subnet
32
2 046
64
1 022
128
510
256
254
126
62
30
14
6
2
1
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